Cloth holder for filter presses



June 2, 1925. 1,540,251

W. BUCKLEY ET AL CLOTH HOLDER FOR FILTER PRESSES Filed Feb, 28, 1925 l l A y m -rwhole length of each edge of the cell, `aldeteriorate with use. i

Patented June 2, 1925. y ,a

UNITED sTATEsJPATENT OFFICE.

WILLIAM BUcKLEY AND JOHN S. CARPENTER, OE cHIoAGO, ILLINOIS; sAID CAR- PENTER ASSIGNOR To SAID EUOKLEY.

CLOTH HOLDER EOR FILTER PRESSES.

ApplicationledrFebi'uary 28, 1923. Serial No.7621f722.

To all whom it may concer/n.:

Be it Vknown that we, `WILLIAM BUCKLEY andJoHN S. CARPENTER, both citizens of the United States, and residents of the city `of Chicago, in the county of Cook and State of Illinois, have invented `certain new and useful Improvements in a Cloth Holder for Filten Presses; and we do hereby declare that the following isa full, clear, and exact i description of thefsame, reference being `had `to the accompanying draw1ngs,and to the numerals of reference marked L thereon,

which form a partf of this specification. It is an object of this invention to provide a device which shall hold thecloth in a filter press cell smoothly in place whilethe` press `isfbeing assembled. f f

l It isa further object of thisiinvention to provide a device of the `class, mentioned `which shall exert Va firm pressure over the though fastened only at the corners.

Itis a furtherA objects of this [invention to provide a device of the class described.

readily and easily applied andnot likely to It is a further object of this undue'strai'n and rapid deterioration.

`Other and further important objects of vthis invention will be apparent Afrom the disclosures in the specification `and the accompanying drawings. Y i r" i The invention (in va preferred' form) is illustrated in the drawings` and hereinafter more fully described. i

- Onthe drawings:

plate. with the cloth .in place and the cloth holding frame applied thereto.

l 'Figure 2 is a section upon .a larger scale on` the line 2-2 of Figure 1. 1

Figure 3 is a section upon .a still larger scale upon the line 3-3 of Figure 1.

i Figure 4 Vis-a Vdetail section showing a modification. f if v `shown on'thedrawings:

` j The cells of the-filterlpress are madein pbase plates.V have theyusualjducts'11 for draining.awaytheffiltered liquid and the which sha-ll Abe inexpensive to manufacture,l

invention to V protect the cloth of a filter press cell from duced into the press and pressure is exerted V `of l* an elastic nature.

ing sloping shoulders 12; The thicker part `of the base plates outside of these shoulders constitutes a frame 13 completely surrounding the thinner portions of the base plate and serving to receive vand transmit the pressure when the plates are forced toward one another in the filter press. At the center of each base plate is a hole 14 surrounded by a collar'l which extends up above lthe general level ofthe base plate, but not as high as the frame 13. Each baseplate is covered with fabric 16, `the two 'sheets'.of. fabric upon the two faces'of the baseplate being united by portionswhich pass through the hole 14, as indicated by the seam .17 in Figure 3. Between each sheet/of fabric and the base plate `are the usual foraminated platesiorscreens 18 supported at frequent intervals by proj ections on the base plate.` None of these projections, however,extend as high'asCthe collar 15.

The outermargins of thefabric lfextend tion,`the fabric 16 passes over the shoulders 12. Whenthe liquid tobe filtered isintrothe fabric will becertainly .supported by the perforated rplate 18 and will not be dragged gure' 1 isa side view of a filter press across the shoulder`s`12 or pulled at these shoulders, afconsiderable .strain upon the the liquids filtered are of aikind'th'at tend to deteriorate thgfber of the fabric.

- For-this purpose, a frame 20r of vsheet ma- 'tjerial'is provided to hold the fabric in, place closely lcontacting with the perforatedl plate 18. "This frame is made, ofsheet material Sheet brass Inaybe. used except'inthose cases wherer the liquid vto be filtered attacks brass VThe, frame Q0 is built intwolayers; The lowerlayer Qlis IpreferablyV all 'in one piece. 'The layer is therefore in* the fqrm of a yhollow rectangle. y usual extrathckness at their dges provid# :Theuppewlayer 1s made" ofI corner" pie'ce's iid sol

23 and of strips 24 extending from each corner piece to the next. The corner pieces'` Holes for 23 are riveted to the layer 21. rivets are made in the strips 24A and 1n the corresponding part ofthe layer 21` but these holes, when the fran/ie is being asseinbled,do not register, the holes 1n the strips 24 being ure 2but it is there veryimuch exaggerated for the sake of showing 1t. ,In the actualV construction` the departure from a flat frame is very much less than is shown 1n this iigure. At the four corners 'the frameis pro-l vided With tongues 27 which enter `corresponding. recesses in thefshoulders 12, asl

may be seen at 28 in Figure 2.l Y In the use of the device, when assembling the lter press, the screens 18 are first placedl against the base platey 10. The clothb'elonging with any base plate ismade of two parts sewed together at the seaml?.v One of vthese two parts is vvpassed through the hole 14. Each of the two parts is then spread out over its face of the base plate and made-to lie flat against itsvscreen 18. The vframe 20 is then bentenough to enable the tongues 27 to Vbe introduced into Vthe slots28. Preferably the fabric 16 is provided with holes which, whenthefabric is'in place, register with the slots 28 and sojafford passagey for the tongues. Then the tongues have been introduced into the slots 28, the frame will lie nearly flat against the cloth.

The buckling or curling of the layer 21 and the fact that the strip 24 isshorter than the corresponding part of the layer 21 will cause the central part of each side of the rectangular frame to press elastically against the cloth, bringing it snugly into position y where the screen 18 meets the shoulder 12.

Cil

The shorter strip 24 and the corresponding longer part of the layer 21 give to each side of the frame ,a structure very like` a truss so that, although heldY only at each end, the

middle partrof the sidewill press against the Ycloth practically as well as the ends do. Moreover, since the arcuate member of the truss is only kvery slightlyV bowed, the pressure thereof against the cloth fflattens a very f considerable length of'said member withthe result that anpeffectiverpressure is exerted against Y the cloth over almosty the whole length of the side.V Thus', before the press is assembled, thecloth -is made to liersnugly against the screen 18 along all four edges.

Application of Huid pressure to the cloth `twill therefore not r.cause any1 further tend ency for the margin of the cloth to creep "ini with its bottom cut away.

27. These tongues arev secured Votherwise than necessitated by ward over theedge of the screen 18. Consequently the fact that these margins are clamped when the press is tightened will not induce any strain at the angle between the Vfiat face ofthe fran'i'e 13 andthe oblique shoulder 12, nor' any strain at the angle between `this shoulder and the screen 18. Belcause the fabric is Vwholly supported by the lscreen 1,8 orvthe oblique face of the shoulder 12,l no lincrease in pressure `against the fabric will cause any pull across said :oblique face. v n v When the cloth has thus `been fastened in position by application of the frame 21, the several units, are united in the A[ilter press by being strung along the feeding tube 80, the several plates being supported'during this assembly of, the press by'nieans'of thefears 31. "When the press is tightened, the pressure of each yplate 10 against its neighbor vcauses the margins of the fabric tobe pinched between the facesfof the frames 13. YlVhenliquid with its suspended'solids is introduced throughthe pipe .30, it passes into the space 32.v VFrom there ythe liquid` passes through the fabric 16 Aleavingthe solids in the space 32. As the solids acouinulate on the inner -face ofthe fabric, the pressure tending to urge the liquid through thefabric presses the fabric more and more firm-ly against the screen 18, but no motion of the fabric. takes placeand `therefore no stretching atits edges or corners, because the fabricris already' flat against the screen 18;- No matter how great the vpressure eX-r4 erted vby the liquidis, `it produces no tendency to tear the cloth at the very points where heretofore'it was yinostv frequently torn.V i

In the modification shown in Figure 4, the frame is shown in the form of a tray The beveled sides 40 standat such an angle to the bottorn 41 that they t' the beveledl shoulders 12. ,The vframe is in its structural charfacter like anv anglecbar and ,consequently will eXert pressure .against the cloth throughout the whole `length of each'side of the frame without the necessity ofthe.

two-layer structure explained in connection with Figure 1. At each of the four corners tongues 42 arejprovided toco-operatewith the slots 28 in the'salne way as the tongues lique shoulders, said frame lbeing of great" to the 1 frame 'June 2, 1925;

R. N. CHAMBERLAIN STORAGE BATTERY Filed Aug. 27. 1921 

